Describe the development of Earth's modern atmosphere from its formation to the present day
What will be an ideal response?
Answer: The first atmosphere was devoid of oxygen and would be toxic to life. Over time, the atmosphere evolved. The ozone layer prevented most ultraviolet energy from reaching the surface. This allowed plants to do photosynthesis, which is the source for oxygen in our present atmosphere.
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What is the link between weathering and making sediment?
What will be an ideal response?
The zone of ____________________ is the portion of a glacier where additions exceed losses. Fill in the blank(s) with the appropriate word(s)
Secondary sewage treatment is distinguished form primary sewage treatment by the ________
A) addition of bacteria to process organic contaminants B) aeration of liquid effluent following chlorination C) chlorination of the liquid effluent D) removal of inorganic nutrients from the liquid effluent E) separation of the suspended solids from the liquid effluent
Bending of water with depth causes a net transport of water known as ____________________
Fill in the blank with correct word